China Optical Lense, Find details about China Glass Fresnel Lens, Tempered Glass Cover from Optical Lense
A Fresnel lens (pronounced /frenl/ fray-NEL or /frznl/ FREZ-nel) is a type of compact lens originally developed by French physicist Augustin-Jean Fresnel for lighthouses.[1]
The design allows the construction of lenses of large aperture and short focal length without the mass and volume of material that would be required by a lens of conventional design. A Fresnel lens can be made much thinner than a comparable conventional lens, in some cases taking the form of a flat sheet. A Fresnel lens can capture more oblique light from a light source, thus allowing the light from a lighthouse equipped with one to be visible over greater distances.( From Wikipedia, the free encyclopedia)